These categories are used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience.

These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

Administrators: Please do not delete this category even if it is empty!
This category may be empty occasionally or even most of the time.

This is a tracking category for "CS1 citations that use |author=, or its aliases.

Articles are listed in this category when Module:Citation/CS1 identifies citations that use singular forms of author name-list parameters to list multiple names. Doing so corrupts the citation's metadata.

Replacing a singular |author= or |last= with the plural |authors= removes all author information from the template's "COinS metadata. Enumerating the author list with |authorn=, or |lastn= / |firstn=, or, where appropriate, |vauthors=, all preserve the associated metadata.

The citation module code looks for multiple comma or semicolon separator characters. This means that there can be some false positives in this list, so this maintenance message and category are hidden for most editors and readers.

While most of the "Citation Style 1 and "Citation Style 2 error messages are visible to all readers, some remain hidden. Editors who wish to see all of the CS1|2 error messages can do so by updating their "common or "skin CSS stylesheet to include:

Even with this css installed, older pages in Wikipedia's cache may not have been updated to show these error messages even though the page is listed in one of the tracking categories. A "WP:NULLEDIT will resolve that issue.

The above code is required if you wish to see maintenance category messages: